Research and Development in the Glass Fiber Sodium-Sulfur Battery
Annual technical rept.
DOW CHEMICAL U S A WALNUT CREEK CA
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The hollow fiber sodium-sulfur cell has been shown to have outstanding electrochemical characteristics. The major problem is to obtain increased lifetimes and still maintain the good performance. By observing the mode of failure of operating cells the authors have been able to separate those factors that cause shortened lifetime into several categories. They include 1 glass fiber weakening at the tube sheet due to reaction with the tube sheet material 2 mechanical configurations or damage that puts excess strain on parts of the cell and, 3 degradation of the fiber itself as a function of its electrochemical environment. Small assemblies have been built in which degradation from the sodium side can be isolated from degradation occurring on the sulfide side of the cell. These assemblies allow the authors to run Na-Na cells in which they can change the quality of the sodium anolyte, the current density, and the number of column volumes of sodium charged or discharged per cycle.
- Electrochemical Energy Storage